I am a big fan of turn-based strategy games, and this is definately one of the best TBS games out there. There is a great variety of races and units. For me, the greatest challenge to overcome is simply the limitations the game places on you for building units each turn. It is very fair and a realistic/excellent system, but it takes a little getting used to. Once I got used to it though, it is incredible. Another aspect that I find interesting about this game is the importane of the heroes in this game. By fully exploiting a hero's special ability, a player can find many of the abilities lending tremendous impacts to each scenario.
I would definately recommend this to anyone who is a fan of TBS games. Two thumbs way up!